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It will probably stop stretching at some point, but nylon is rather high-memory even in fabric...so it'll stretch while you're in it and then pop back a bit when you get out. That will make the measurements and predictions hard.

The harder problem for calculating this project is that the stretch won't be uniform. It'll stretch a lot more under your butt than along the legs, for example. I'd put bigger darts around the waist area.

At the end of the day, this isn't rocket surgery...you can guestimate and then go from there. Just have realistic expectations...consider the first model a prototype and don't expect to get it right. It's more like cloth carpentry..."close enough" is good enough to get you through a season (or at least several trips), and then you'll have enough solid improvements in mind for a much better Prototype.v2.

“Republics are created by the virtue, public spirit, and intelligence of the citizens. They fall when the wise are banished from the public councils because they dare to be honest, and the profligate are rewarded because they flatter the people, in order to betray them.” ~Judge Joseph Story